<template>
    <div class="container">
        <div id="data-pie"></div>
    </div>
</template>

<script>
import * as echarts from 'echarts'
import 'echarts-gl'
import 'echarts/lib/chart/bar'
export default {
    props: ['mapMonth'],
    data() {
        return {
            colors: ["#4EA6D8", "#564AF1", "#3CD495", "#1F9AA7",
                "#F5B64C", "#DD8432"
            ],
            data: [
                {
                    name: '安全帽检测',
                    value: 134,
                    itemStyle: {
                        color: '#4EA6D8',
                    },
                },
               
            ],
            num: 0.7
        }
    },
    mounted() {
        this.initData()
    },
    methods: {
        // 生成配置项
        getPie3D(pieData, internalDiameterRatio) {
            let series = [];
            let sumValue = 0;
            let startValue = 0;
            let endValue = 0;
            let legendData = [];
            let k =
                typeof internalDiameterRatio !== 'undefined'
                    ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
                    : 1 / 3;

            // 为每一个饼图数据，生成一个 series-surface 配置
            for (let i = 0; i < pieData.length; i++) {
                sumValue += pieData[i].value;

                let seriesItem = {
                    name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,
                    type: 'surface',
                    parametric: true,
                    wireframe: {
                        show: false,
                    },
                    pieData: pieData[i],
                    pieStatus: {
                        selected: false,
                        hovered: false,
                        k: 1 / 10,
                    },
                };

                if (typeof pieData[i].itemStyle != 'undefined') {
                    let itemStyle = {};

                    typeof pieData[i].itemStyle.color != 'undefined' ? (itemStyle.color = pieData[i].itemStyle.color) : null;
                    typeof pieData[i].itemStyle.opacity != 'undefined'
                        ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
                        : null;

                    seriesItem.itemStyle = itemStyle;
                }
                series.push(seriesItem);
            }

            // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
            // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
            for (let i = 0; i < series.length; i++) {
                endValue = startValue + series[i].pieData.value;

                series[i].pieData.startRatio = startValue / sumValue;
                series[i].pieData.endRatio = endValue / sumValue;
                series[i].parametricEquation = this.getParametricEquation(
                    series[i].pieData.startRatio,
                    series[i].pieData.endRatio,
                    false,
                    false,
                    k,
                    series[i].pieData.value
                );

                startValue = endValue;

                legendData.push(series[i].name);
            }

            // // 补充一个透明的圆环，用于支撑高亮功能的近似实现。
            series.push({
                name: 'mouseoutSeries',
                type: 'surface',
                parametric: true,
                wireframe: {
                    show: false,
                },
                itemStyle: {
                    opacity: 0.1,
                    color: '#E1E8EC',
                },
                parametricEquation: {
                    u: {
                        min: 0,
                        max: Math.PI * 2,
                        step: Math.PI / 20,
                    },
                    v: {
                        min: 0,
                        max: Math.PI,
                        step: Math.PI / 20,
                    },
                    x: function (u, v) {
                        return ((Math.sin(v) * Math.sin(u) + Math.sin(u)) / Math.PI) * 2;
                    },
                    y: function (u, v) {
                        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2;
                    },
                    z: function (u, v) {
                        return Math.cos(v) > 0 ? -0.5 : -5;
                    },
                },
            });

            // // 补充一个透明的圆环，用于支撑高亮功能的近似实现。
            series.push({
                name: 'mouseoutSeries',
                type: 'surface',
                parametric: true,
                wireframe: {
                    show: false,
                },
                itemStyle: {
                    opacity: 0.1,
                    color: '#E1E8EC',
                },
                parametricEquation: {
                    u: {
                        min: 0,
                        max: Math.PI * 2,
                        step: Math.PI / 20,
                    },
                    v: {
                        min: 0,
                        max: Math.PI,
                        step: Math.PI / 20,
                    },
                    x: function (u, v) {
                        return ((Math.sin(v) * Math.sin(u) + Math.sin(u)) / Math.PI) * 2;
                    },
                    y: function (u, v) {
                        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2;
                    },
                    z: function (u, v) {
                        return Math.cos(v) > 0 ? -5 : -7;
                    },
                },
            });
            series.push({
                name: 'mouseoutSeries',
                type: 'surface',
                parametric: true,
                wireframe: {
                    show: false,
                },
                itemStyle: {
                    opacity: 0.1,
                    color: '#E1E8EC',
                },
                parametricEquation: {
                    u: {
                        min: 0,
                        max: Math.PI * 2,
                        step: Math.PI / 20,
                    },
                    v: {
                        min: 0,
                        max: Math.PI,
                        step: Math.PI / 20,
                    },
                    x: function (u, v) {
                        return ((Math.sin(v) * Math.sin(u) + Math.sin(u)) / Math.PI) * 2.2;
                    },
                    y: function (u, v) {
                        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2.2;
                    },
                    z: function (u, v) {
                        return Math.cos(v) > 0 ? -7 : -7;
                    },
                },
            });

            // 准备待返回的配置项，把准备好的 legendData、series 传入。
            let option = {
                //animation: false,
                
                legend: {
                    //left: '50%',
                    top: 'bottom',
                    textStyle: {
                        fontSize: 18,
                        color: '#C6D1DB'
                    },
                    // icon:'diamond',
                    data: legendData,
                    formatter: (params) => {
                        return params;
                    },
                },
                xAxis3D: {},
                yAxis3D: {},
                zAxis3D: {},
                grid3D: {
                    viewControl: {
                        autoRotate: true,
                    },
                    left: 'center',
                    width: '70%',
                    show: false,
                    boxHeight: 60,
                },
                series: series,

            };
            return option;
        },

        getParametricEquation(startRatio, endRatio, isSelected, isHovered, k, h) {
            // 计算
            let midRatio = (startRatio + endRatio) / 2;
            let startRadian = startRatio * Math.PI * 2;
            let endRadian = endRatio * Math.PI * 2;
            let midRadian = midRatio * Math.PI * 2;
            // 如果只有一个扇形，则不实现选中效果。
            // if (startRatio === 0 && endRatio === 1) {
            //     isSelected = false;
            // }
            isSelected = false;
            // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
            k = typeof k !== 'undefined' ? k : 1 / 3;
            // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
            let offsetX = isSelected ? Math.sin(midRadian) * 0.1 : 0;
            let offsetY = isSelected ? Math.cos(midRadian) * 0.1 : 0;
            // 计算高亮效果的放大比例（未高亮，则比例为 1）
            let hoverRate = isHovered ? 1.05 : 1;
            // 返回曲面参数方程
            return {
                u: {
                    min: -Math.PI,
                    max: Math.PI * 3,
                    step: Math.PI / 32,
                },

                v: {
                    min: 0,
                    max: Math.PI * 2,
                    step: Math.PI / 20,
                },

                x: function (u, v) {
                    if (u < startRadian) {
                        return offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
                    }
                    if (u > endRadian) {
                        return offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
                    }
                    return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
                },

                y: function (u, v) {
                    if (u < startRadian) {
                        return offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
                    }
                    if (u > endRadian) {
                        return offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
                    }
                    return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
                },

                z: function (u, v) {
                    if (u < -Math.PI * 0.5) {
                        return Math.sin(u);
                    }
                    if (u > Math.PI * 2.5) {
                        return Math.sin(u) * h * 0.1;
                    }
                    return Math.sin(v) > 0 ? 1 * h * 0.1 : -1;
                },
            };
        },
        initData() {
            const dom = document.getElementById("data-pie")
            let myChart = echarts.init(dom);
            let data = this.mapMonth.map((e,index)=>{
                let item = {
                    value: e.data_count,
                    name: e.src_name,
                    itemStyle: {
                        color: this.colors[index % this.colors.length],
                    },
                }
                return item;
            })

            let options = this.getPie3D(data, this.num);
            myChart.setOption(options);
        },

    }
}
</script>

<style lang="scss" scoped>
.container {
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    
    #data-pie {
        height: 90%;
        width: 90%;
    }
}
</style>